Thermal pump



11 BOUCHER v THERMAL PUMP Filed June s, 1940 l -working chamber of the Patented Jan. 30, 1945 nuaeiff rIv'his invention relates toathermalpu'n'ip; vthe volume of the working chamber of `which is r varied by a heated iluid. According to the invention the workingchamber of the pump Vis separated "from the fluid chamber by a resilientwall.` The decrease in volume of the working ychamber is brought about by heating the fluid and correspondingly increasing the pressurein the fluid' chamben'and the increase in thevolume of` the working chamber is obtained with the'aidof a displacing member cooperating l 'I'his member ismoved awayi'irom "the heating Y lin-,alfGermanyzrvested in V the: Allen ;Prop erty tojoperate the pinby aresllient''wall with the cover plate I ofthe working` chamber rai-Necessita;

s, -Tnefspce -1 communicatesywithtne il'q'u'id contiaiinery 8 through theopenings! andv |02 "'On 'topof the container 8 is locatedv a heatedtube'l I.` rA displa'cer member I2 4is arranged inl ,the container Brfor controlling the suction stroke or 'coin-- pression stroke. The displa'cer I2 lisoassociated v I through a. rocking lever system 13114. The two with the nuid.

zone so that as a result of thesubse'quent cooling i the pressure in the iuid chamberis decreased; A pump is thus ,obtained Iwith the aidofsimple means in which the heat sourcey for theaukiliary iiuid may remain continuously inoperation."

The pump according to` ticularly adapted for use in cases where a mumping effect is brought about ywithout employing auxiliary means for putting thefheatsource -in and out of operation. The devi-ce made according to theinvention may, for instance, be employed as a pump 'Lt'or circulating the solution in absorption re'fgerating appiairatu'sfofI thefcontinuous type. The heat necessary for theoperation of the pump may be supplied by any suitable heat source, such as. for instance, by the-'generator -of the absorptionapparatus. The arrangement according to the invention is'fsofconstructed that theoperating flud'of the ypilini) is heated up to such an extent as todeveloprduring the compression stroke o'ffthe'pump vapors in' order to attain the desired increase vinfpressure.r The heating surface is preferablyarrangedat the upper end of the liquid chamber, the displacing member in thecentral portion, and the working chamber of the pump in the. lowerl'end of-the liquid chamber. t Y

Embodiments of the invention are diagramlmatically shown in the accompanyingdrawing wherein f Y f' n l.

Fig. 1 is a vertical sectional view of pump according to the invention; f

Fig. 2 shows an elevationalfviefwfpartl tion of a modied form of thefpurn'p; and

Fig.v 3 shows the thermal pumpvas applied to an .a thermalA y in secthe invention is'parpairsof levers I3 and Iare cor'in'ected"withother by a spring IjS asshown in Fig.- 11.? Y 11 f inthe position er restthe'lchambersii and sare illledwithfliquid upto th'epointA. -By-"applyin'g heat to thefupperl end of the liquid container'a, the liquidlisfcaused to evaporate and thelpressure produced therebyis transmitted tothe pumping element intheworking chamber I Tl'iere'sil'ient 1 wall 6 compressed so that the liquidfllling'fthe i working chamberv I is forced out throu y gli-thermessure conduit 3Q f The liquid assumes 'thef level "B. At the ends/ofthe compression strokefthei'displacer member rIZis inthe'position B', C'egf structuren vse dimerisieneafngat :the 'quantity-ef 'fiiquia contained betweeothepointsfn and cris .down the displacer elementi moves up; andwvice versa,y andwhen the displacer moves tup tlie'z'fluid in the space between thedisplacer' andfthevcontainer drops"downf-tofll:theispace at the-flower endl of the container vacated.- by'fthei .upwardly moving displacer. The vapors produced asa result olf the heating of-*the .n liquid,x condense again on thea irecooled surface yI 'I so that the pressure l; prevailing in? Vthe spaces 'I andfdecreases. Accordingly, aasuction veffect isexertedon thepumping elementzfworking chamber I whichfcauses lthe space I. toincrease and to idraw in the liquidsuppliedrthrollghlthe suction conduit 2 f As f soon as the angular posiabsorption refrigerating apparatus-of the con- .l

, tinuous type.

tion .ofthe lever-Systemy -I 3,;I l isfsuillcientlydis- V placed uponfthe movement-ofthecovenplateel in the upward/direction, the ,displacer lzsisagain brought l automatical1y--` into .,tha; lower; position.

The liquid is thus displacedfagain fromkthe space C, C,"y in the'fiupwarddirectlon sothati-ittfcomes againintodirect heatrcontact 'withfthepheating I 'Surface II.,and1fthe ycompressionstrokenomthe connected to the pump. I1

' ing lever system is secured the plate tion shown in Fig. 1 is characterized by the provision of rigid walls which completely surround the movable parts of the pump. This is of particular advantage, since the pump is thus coinpletelyprotected.

Fig. 2 showsa somewhat modified form of the invention. Numeral denotes the heating tube is the condensation of the rock- 22 which forms together with theresilient wall 2| the lower closure of the chamber'. The rod |4 is also secured to the upper cover plate 25 of the working chamber 24 of the pump. Numeral 28 denotes a resilient wall and 21 the stationary bottom of the working chamber 24 to which are connected the suction conduit 28 and the pressure conduit 29.

Fig. 3 shows an absorption refrigerating apparatus of the continuous type provided with a Dump This pump serves to circulate the strong solution. 3| is the generator of the absorption appa ratus. The vapors developed in the generator 3| pass through a rectifier into the condenser 33,

surface of the pump. To the rod I4 from where the liquiiled refrigerant flows 1 through a throttle valve 34 into the evaporator 35 arranged in the cooling chamber. The vaporized refrigerant then passes from the evaporator 35'into the air-cooled absorber 36 through the conduit 43 and the conduit 39 wound around the part 4| of the pump. This part of the pump is thus additionally cooled by the cold refrigerant vapors. The conduit 42 serves to remove the liquid absorbent-which might be entrained with the liquid refrigerant into the evaporator. Numerals 44 and 45 denote the conduits leading to the pump 40 and through which the strong solution is forced by the pump 40 through the heat exchanger 31 Iinto the generator 3l. The spent solution passes again through the conduit 46 and the float-operated valve 33 back into the absorber 3B. The heated tube 48 of the part 4| of the pump extends into the heated passageway 41 of the generator 3|. The pump is therefore heated by the waste gases of the generator.

The condensation surface of the part 4| of the pump is intense etant owing f om the evaporator to the absorber. By suitably dimensioning the condensation surface the number of strokes of the pump may be varied in accordance with the quantity of vaporous refrigerant.

To create the desired pressure within the pump a. suitable solution may beemployed for use as an operating fluid.

What is claimed is:

1. A pump for circulating a working fluid comprising a sylphon-like body forming an internal working chamber for receiving such fluid,` means forming a, separate chamber superposed on said working chamber andcontaining an operating fluid, means for applying heatto a predetermined conflned section of said separate chamber to evaporate part of said operating fluid therein whereby the pressure within said separate chamber is increased and said operating fluid is disrplaced downwardly away from the confined section aiected by said heat applying means, the displacement of said operating uuid within said separate chamber removing it from contact with said heat applying means and causing subsequent cooling thereof and decrease in pressure in said separate chamber, interconnecting means between said chambers for causing said sylphonlike body and said working chamber formed 40, 4| designed according to the invention.

cooled by the vapor-ous refrigchamber for governing thereby alternately to contract and to expand responsive to the increase and decrease,l respectively, of the pressure in said separate chamber, andyalve means connected with said working chamber for e Y lling therefrom working fluid contained therein and for alternately admitting said working uid thereinto responsive to the alternate contraction and expansion thereof, re-

. spectively.

2. The device defined in claim 1, wherein said heat applying means is substantially constantly active during the operation of said pump.

3. The -device defined in claim l, together with means applied to said separate chamber from the outside thereof for effecting rapid cooling of the operating uid, therein subsequent to displacement thereof.

4. The device defined in claim 1, wherein said heat applying means is substantially constantly active during the operation of said pump, together with means applied to said separate chamber for effecting rapid cooling of the operating fluid therein subsequent to displacement thereof.

5. The device defined in claim 1, together with a displacer member disposed in said separate chamber and connected with said sylphonV body for governing-the displacement of the operating fluid therein inaccordance with the movements of the displacer member.

6. The device dened in claim 1, together with a displacer member disposed in said separate chamber for governing the displacement of the operating fluid therein in movements of the displacer member, and link means connecting said member with said sylphon body forming said working chamber to control the contraction and expansion operation thereof.

'7. The device defined in claim 1, together with a displacer member disposed in said separate chamber for governing the displacement of the operating fluid therein in accordance with the movements of the displacer member, link means connecting said member with said sylphon body forming said working chamber to control the contraction and expansion operation thereof, and housing means for completely enclosing said working chamber and said link means.

8. The device defined in claim 1, together with a displacer member disposed in said separate the displacement of the operating fluid' therein in accordance with the movements of the displacer member, link means connecting said member with the sylphon body formingsaid working chamber to control the contraction and expansion operation thereof, and housing means for completely enclosing said working chamber and said link means, said housing means being rigidly connected with the means forming said separate chamber and forming a unit therewith.

9.A In a refrigerating apparatus of the class described, the combination of a heat operated refrigerant generator and an evaporator and absorber for receiving said refrigerant, with a heat operated pump for circulating strong solution between said absorber and said generator, said pump comprising means forming a pumping chamber for said strong solution, means forming a separate control chamber containing an operating fluid. common heat producing means for said generator and for heating ,the operating duid in said control chamber, said operating fluid being displaced withinv said control chamber and the pressure therein being increased responsive to such heataccordance with the aaearoi ing, cooling means for said control chamber for subsequently cooling said operating uid to reduce the pressure therein. means responsive to the pressure fluctuations in said control chamber for causing the strong -solution in said pumping chamber to circulate, and means :for circulating through said coolingr means refrigerant iiowing from the evaporator to the absorber.

10. The combination and structure defined in claim 9, wherein two plates separated by bellowslike side ywalls, constitute the means forming the pumping chamber, and wherein the pressure iiuctuations in said control chamber alternately contract and expand said pumping chamber to circulate the strong solution therein through the medium of valve means connected thereto.

1i. The combination and structure defined in claim 9, together with means' in said control chamber for governing the displacement of the operating uid therein responsive to alternate heating and cooling thereof, and means linking said last named means with said pumping charnber for` controlling said displacement in accordance with the pumping action thereof.

12. The combination and structure dened in claim 9, wherein two plates separated by bellowslike side walls constitute the means forming the vpumping chamber, together with means in said control chamber for governing the displacement of the operating fluid therein responsive to alternate heatingr and cooling thereof, link means connecting said last named means with said pumping chamber for controlling said displacement in accordance with the pumping action thereof, and housing means completely enclosing said link means and said pumping chamber.

13. A pump device of the class described comprising a uid containing valve-controlled sylphon body forming a pumping element ifor the fluid contained therein, means forming a sealed liquid containing chamber,A means for applying heat to said chamber at a point above the liquid surface therein to cause evaporation conned within said chamber of part of said liquid from the surface thereof and consequent increase of pressure in said chamber and downward compression displacement of the liquid surface therein away from said heat applying means whereby said displaced liquid is cooled again by contact with the wall of said chamber remote from said heat applying means to reduce the pressure in said chamber and allow upward return expansion of the liquid, and means for transmitting the alternate compression and expansion displacement of said liquid in said chamber to said pumping element.

14. The pump device defined in claim 13, together with a displacer member in said chamber for controlling the displacement of the liquid` therein, said member being connected with said sylphon body and moving within said liquid upvwardly during the downward compression and downwardly during the upward expansion of the sylphon body.

15. The pump device defined in claim 13, together with a displacer member in said chamber for controlling the displacement of the liquid therein, said member being connected with said sylphon body and moving Awithin said liquid Aupwardly during the downward compression and downwardly during the upward expansion of the sylphon body, and link means connecting said displacer member with said pumping element.

16. 'I'he pump device dened in claim 13, together with a sylphon-like extension on said chamber which is alternately expanded and contracted responsive to compression and expansion displacement of the liquid therein, and means connecting said sylphon-like extension with said pumping element constituting the means for displacement of said transmitting the alternate liquid thereto.

1'7. The pump device defined in claim 13, to-4 40'gether with means for cooling the wall of said Vchamber disposed at a point remote from said heat applying means.

RUDOLFBO'I'ICHER. 

